GeoStar introduces the Aston Compact and Arbor Base to its product line of commercial water-source units. The Aston Compact is available in capacities from 0.75 to 6 tons. It features the Aurora generation of communicating controls and a variety of options, including a factory-installed 24V motorized on/off water valve option, hot-gas bypass and reheat, and high-efficiency PSC five-speed ECM or variable-speed ECM blower motors. The Arbor Base has a number of value-added features in a 0.5- to 6-ton unit. Both units use environmentally friendly R410A refrigerant and exceed ASRAE 0.1 efficiencies.